#include <stdio.h>

int Sum(int n)
{
    int sum=0;
    int i=1;
    for(i=1;i<=n;i++)
    {
        sum=sum+i;
    }
    return sum;
}


int main()
{
    printf("hello world\n");
    int result=Sum(100);
    printf("result=%d\n",result);
    return 0;
}
